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Revenue Recognition - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Contract with customer, liability $ 6,300,000,000    
Accounts receivable, credit loss expense (reversal) 0 $ 0 $ 0
Revenues 4,981,900,000 3,318,300,000 2,881,100,000
Other Income 11,200,000 10,600,000 9,000,000.0
Designated as Hedging Instrument      
Disaggregation of Revenue [Line Items]      
Total (loss) gain recognized in income (488,600,000) (160,300,000) 16,900,000
(Loss) gain realized in income on derivatives (460,100,000) (39,200,000) 44,300,000
Unrealized (loss) gain recognized in income on derivatives (28,500,000) (121,100,000) (27,400,000)
Derivative contracts related to forecasted sales | Designated as Hedging Instrument      
Disaggregation of Revenue [Line Items]      
Total (loss) gain recognized in income (490,900,000) (160,700,000) 4,700,000
(Loss) gain realized in income on derivatives (455,100,000) (45,600,000) 34,300,000
Unrealized (loss) gain recognized in income on derivatives (35,800,000) (115,100,000) (29,600,000)
Financial trading contracts | Designated as Hedging Instrument      
Disaggregation of Revenue [Line Items]      
Total (loss) gain recognized in income 10,700,000 6,100,000 (700,000)
(Loss) gain realized in income on derivatives 1,100,000 4,600,000 4,200,000
Unrealized (loss) gain recognized in income on derivatives 9,600,000 1,500,000 (4,900,000)
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument      
Disaggregation of Revenue [Line Items]      
Unrealized (loss) gain recognized in income on derivatives (35,800,000) (115,100,000) (29,600,000)
Corporate and Other (1)      
Disaggregation of Revenue [Line Items]      
Revenues $ 1,700,000 (3,700,000) (15,600,000)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01      
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation, percentage 40.00%    
Revenue, remaining performance obligation, period 12 months    
Other (2)      
Disaggregation of Revenue [Line Items]      
Revenues $ 12,800,000 15,400,000 17,400,000
Other (2) | Corporate and Other (1)      
Disaggregation of Revenue [Line Items]      
Revenues 1,700,000 (3,700,000) (15,600,000)
Trading and Brokerage Coal Deliveries | Corporate and Other (1)      
Disaggregation of Revenue [Line Items]      
Revenues 470,700,000 140,300,000 $ (28,600,000)
Miscellaneous Receivables      
Disaggregation of Revenue [Line Items]      
Accounts receivable, allowance for credit losses 700,000,000 700,000,000  
Trade Accounts Receivable      
Disaggregation of Revenue [Line Items]      
Accounts receivable, allowance for credit losses $ 0 $ 0